I've entered my fill-ups from last year one after each other based on my excel sheet.
I've always added the dates, but fuelio does not sort them by date. It seems to sort them by the order I've entered them, which was not exactly the date order. (After all, I'm human)
It especially visible in the odometer graph, when it seems I've been reversing at some times :)
Customer support service by UserEcho